How to convert millimeters to inches
Use the converter above or multiply by the factor: inches = millimeters × 0.0393701. So 1 mm = 0.0393701 in. Enter a value in millimeters and the converter shows the result in inches instantly — free, no sign-up.
Worked examples
- 1 mm = 0.03937 in
- 10 mm = 0.3937 in
- 100 mm = 3.937 in
Millimeters to inches conversion table
| Millimeters (mm) | Inches (in) |
|---|---|
| 1 | 0.03937 |
| 2 | 0.07874 |
| 5 | 0.1969 |
| 10 | 0.3937 |
| 20 | 0.7874 |
| 50 | 1.969 |
| 100 | 3.937 |
| 500 | 19.69 |
| 1000 | 39.37 |
Practical use: small parts, jewellery, DIY measurements.
Frequently asked questions
How many in are in 1 mm?
1 mm = 0.0393701 in.
What is the formula to convert mm to in?
Multiply millimetres by 0.0393701.
How do I convert back from in to mm?
1 in = 25.39999 mm.
What is 25 mm in in?
25 mm = 0.98425 in.